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                <a class="post-title-link" href="/2018/03/17/JAVA内部类笔记/" itemprop="url">JAVA内部类笔记</a></h2>
        

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            <p>这是我学习Java内部类的笔记<br>1.为什么使用内部类?<br>使用内部类最吸引人的原因是：每个内部类都能独立地继承一个（接口的）实现，所以无论外围类是否已经继承了某个（接口的）实现，<br>对于内部类都没有影响<br>1.1.使用内部类最大的优点就在于它能够非常好的解决多重继承的问题,使用内部类还能够为我们带来如下特性:<br>(1)、内部类可以用多个实例，每个实例都有自己的状态信息，并且与其他外围对象的信息相互独。<br>(2)、在单个外围类中，可以让多个内部类以不同的方式实现同一个接口，或者继承同一个类。<br>(3)、创建内部类对象的时刻并不依赖于外围类对象的创建。<br>(4)、内部类并没有令人迷惑的“is-a”关系，他就是一个独立的实体。<br>(5)、内部类提供了更好的封装，除了该外围类，其他类都不能访问。<br>2.内部类分类:<br>(一).成员内部类:</p>
<p>public class Outer{<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> age = <span class="number">99</span>;</span><br><span class="line">    String name = <span class="string">"Coco"</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Inner</span></span>&#123;</span><br><span class="line">        String name = <span class="string">"Jayden"</span>;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">show</span><span class="params">()</span></span>&#123;</span><br><span class="line">            System.out.println(Outer.<span class="keyword">this</span>.name);</span><br><span class="line">            System.out.println(name);</span><br><span class="line">            System.out.println(age);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> Inner <span class="title">getInnerClass</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> Inner();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span>&#123;</span><br><span class="line">        Outer o = <span class="keyword">new</span> Outer();</span><br><span class="line">        Inner in = o.new Inner();</span><br><span class="line">        in.show();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>1.Inner 类定义在 Outer 类的内部，相当于 Outer 类的一个成员变量的位置，Inner 类可以使用任意访问控制符，<br>如 public 、 protected 、 private 等<br>2.Inner 类中定义的 show() 方法可以直接访问 Outer 类中的数据，而不受访问控制符的影响，<br>如直接访问 Outer 类中的私有属性age<br>3.定义了成员内部类后，必须使用外部类对象来创建内部类对象，而不能直接去 new 一个内部类对象，<br>即：内部类 对象名 = 外部类对象.new 内部类( );<br>4.编译上面的程序后，会发现产生了两个 .class 文件: Outer.class,Outer$Inner.class{}<br>5.成员内部类中不能存在任何 static 的变量和方法,可以定义常量:<br>(1).因为非静态内部类是要依赖于外部类的实例,而静态变量和方法是不依赖于对象的,仅与类相关,<br>简而言之:在加载静态域时,根本没有外部类,所在在非静态内部类中不能定义静态域或方法,编译不通过;<br>非静态内部类的作用域是实例级别<br>(2).常量是在编译器就确定的,放到所谓的常量池了<br>★★友情提示:<br>1.外部类是不能直接使用内部类的成员和方法的，可先创建内部类的对象，然后通过内部类的对象来访问其成员变量和方法;<br>2.如果外部类和内部类具有相同的成员变量或方法，内部类默认访问自己的成员变量或方法，如果要访问外部类的成员变量，<br>可以使用 this 关键字,如:Outer.this.name<br>(二).静态内部类: 是 static 修饰的内部类,<br>1.静态内部类不能直接访问外部类的非静态成员，但可以通过 new 外部类().成员 的方式访问<br>2.如果外部类的静态成员与内部类的成员名称相同，可通过“类名.静态成员”访问外部类的静态成员；<br>如果外部类的静态成员与内部类的成员名称不相同，则可通过“成员名”直接调用外部类的静态成员<br>3.创建静态内部类的对象时，不需要外部类的对象，可以直接创建 内部类 对象名 = new 内部类();</p>
<p>public class Outer{<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> age = <span class="number">99</span>;</span><br><span class="line">    <span class="keyword">static</span> String name = <span class="string">"Coco"</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Inner</span></span>&#123;</span><br><span class="line">        String name = <span class="string">"Jayden"</span>;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">show</span><span class="params">()</span></span>&#123;</span><br><span class="line">            System.out.println(Outer.name);</span><br><span class="line">            System.out.println(name);                  </span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span>&#123;</span><br><span class="line">        Inner i = <span class="keyword">new</span> Inner();</span><br><span class="line">        i.show();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>(三).方法内部类：其作用域仅限于方法内，方法外部无法访问该内部类<br>(1).局部内部类就像是方法里面的一个局部变量一样，是不能有 public、protected、private 以及 static 修饰符的<br>(2).只能访问方法中定义的 final 类型的局部变量,因为:<br>当方法被调用运行完毕之后，局部变量就已消亡了。但内部类对象可能还存在,<br>直到没有被引用时才会消亡。此时就会出现一种情况，就是内部类要访问一个不存在的局部变量;<br>==&gt;使用final修饰符不仅会保持对象的引用不会改变,而且编译器还会持续维护这个对象在回调方法中的生命周期.<br>局部内部类并不是直接调用方法传进来的参数，而是内部类将传进来的参数通过自己的构造器备份到了自己的内部，<br>自己内部的方法调用的实际是自己的属性而不是外部类方法的参数;<br>防止被篡改数据,而导致内部类得到的值不一致</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"> <span class="comment">/*使用的形参为何要为 final???</span></span><br><span class="line"><span class="comment"> 在内部类中的属性和外部方法的参数两者从外表上看是同一个东西，但实际上却不是，所以他们两者是可以任意变化的，</span></span><br><span class="line"><span class="comment"> 也就是说在内部类中我对属性的改变并不会影响到外部的形参，而然这从程序员的角度来看这是不可行的，</span></span><br><span class="line"><span class="comment"> 毕竟站在程序的角度来看这两个根本就是同一个，如果内部类该变了，而外部方法的形参却没有改变这是难以理解</span></span><br><span class="line"><span class="comment"> 和不可接受的，所以为了保持参数的一致性，就规定使用 final 来避免形参的不改变</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Outer</span></span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">Show</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">final</span> <span class="keyword">int</span> a = <span class="number">25</span>;</span><br><span class="line">        <span class="keyword">int</span> b = <span class="number">13</span>;</span><br><span class="line">        <span class="class"><span class="keyword">class</span> <span class="title">Inner</span></span>&#123;</span><br><span class="line">            <span class="keyword">int</span> c = <span class="number">2</span>;</span><br><span class="line">            <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">print</span><span class="params">()</span></span>&#123;</span><br><span class="line">                System.out.println(<span class="string">"访问外部类:"</span> + a);</span><br><span class="line">                System.out.println(<span class="string">"访问内部类:"</span> + c);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        Inner i = <span class="keyword">new</span> Inner();</span><br><span class="line">        i.print();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span>&#123;</span><br><span class="line">        Outer o = <span class="keyword">new</span> Outer();</span><br><span class="line">        o.show();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>(3).注意:在JDK8版本之中,方法内部类中调用方法中的局部变量,可以不需要修饰为 final,匿名内部类也是一样的，主要是JDK8之后增加了 Effectively final 功能<br><a href="http://docs.oracle.com/javase/tutorial/java/javaOO/localclasses.html" target="_blank" rel="noopener">http://docs.oracle.com/javase/tutorial/java/javaOO/localclasses.html</a><br>反编译jdk8编译之后的class文件,发现内部类引用外部的局部变量都是 final 修饰的<br>(四).匿名内部类:<br>(1).匿名内部类是直接使用 new 来生成一个对象的引用;<br>(2).对于匿名内部类的使用它是存在一个缺陷的，就是它仅能被使用一次，创建匿名内部类时它会立即创建一个该类的实例，<br>该类的定义会立即消失，所以匿名内部类是不能够被重复使用;<br>(3).使用匿名内部类时，我们必须是继承一个类或者实现一个接口，但是两者不可兼得，同时也只能继承一个类或者实现一个接口;<br>(4).匿名内部类中是不能定义构造函数的,匿名内部类中不能存在任何的静态成员变量和静态方法;<br>(5).匿名内部类中不能存在任何的静态成员变量和静态方法,匿名内部类不能是抽象的,它必须要实现继承的类或者实现的接口的所有抽象方法<br>(6).匿名内部类初始化:使用构造代码块！利用构造代码块能够达到为匿名内部类创建一个构造器的效果</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">OuterClass</span> </span>&#123;      </span><br><span class="line">	<span class="function"><span class="keyword">public</span> InnerClass <span class="title">getInnerClass</span><span class="params">(<span class="keyword">final</span> <span class="keyword">int</span>   num,String str2)</span></span>&#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="keyword">new</span> InnerClass()&#123;</span><br><span class="line">                <span class="keyword">int</span> number = num + <span class="number">3</span>;</span><br><span class="line">                <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getNumber</span><span class="params">()</span></span>&#123;</span><br><span class="line">                    <span class="keyword">return</span> number;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;;        <span class="comment">/* 注意：分号不能省 */</span></span><br><span class="line">        &#125;</span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">            OuterClass out = <span class="keyword">new</span> OuterClass();</span><br><span class="line">            InnerClass inner = out.getInnerClass(<span class="number">2</span>, <span class="string">"chenssy"</span>);</span><br><span class="line">            System.out.println(inner.getNumber());</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="class"><span class="keyword">interface</span> <span class="title">InnerClass</span> </span>&#123;</span><br><span class="line">        <span class="function"><span class="keyword">int</span> <span class="title">getNumber</span><span class="params">()</span></span>;</span><br><span class="line">    &#125;  </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
          
        
      
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